CN112778916A

CN112778916A - Special fluorine-containing pressure-sensitive adhesive and preparation method thereof

Info

Publication number: CN112778916A
Application number: CN202011616208.8A
Authority: CN
Inventors: 马小燕; 李伟; 邹伟; 颜杰; 杨虎; 李颜利; 郑汶江; 梁晓峰
Original assignee: Sichuan University of Science and Engineering
Current assignee: Sichuan University of Science and Engineering
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-05-11
Anticipated expiration: 2040-12-30
Also published as: CN112778916B

Abstract

The invention discloses a special fluorine-containing pressure-sensitive adhesive which is characterized by comprising an adhesive and a base material, wherein the adhesive is coated on one side surface of the base material; the adhesive comprises a component A and a component B; the component A comprises the following components in percentage by mol: 5-50% of a pentafluorobenzene-containing functional monomer; the initiator is 0.1% -0.5%; the soft monomer accounts for 50% -95%; the hard monomer is 0% -50%; 0% -50% of a cross-linking agent; the component B is a solvent, and the mole number of the component B is 3-8 times of the total mole number of the component A. The special pressure-sensitive adhesive of the invention has better guarantee on cohesive force, solvent resistance, adhesive force and the like during bonding aiming at the fluorine-containing polymer material, has high crosslinking speed and simultaneously has no solvent discharge. The invention also provides a preparation method of the special fluorine-containing pressure-sensitive adhesive, and provides a new thought and development direction for the development of the pressure-sensitive adhesive.

Description

Special fluorine-containing pressure-sensitive adhesive and preparation method thereof

Technical Field

The invention relates to the technical field of fluorine-containing materials, in particular to a special fluorine-containing pressure-sensitive adhesive and a preparation method thereof.

Background

With the rapid increase of national economy, a large number of fluorine-containing products are coming into various fields of aviation, environmental protection, communication, medical treatment and the like. The pressure-sensitive adhesive is used as a part of the adhesive, can be instantly adhered at room temperature because the pressure-sensitive adhesive is a pressure-sensitive adhesive material, and has the excellent properties of being capable of being adhered to the surfaces of various base materials only by slight pressure load, having no residue after the base materials are peeled off, and the like.

When the base material is made of inert material, the adhesive has poor adhesion effect on the inert material due to high non-polarity, low surface energy and poor wettability of the inert material. For the adhesion of inert materials, the surface of the material is subjected to sexual pretreatment, functional groups such as hydroxyl groups are introduced, the reaction degree of the adhesive and the surface of the material is improved, and the bonding strength of the adhesive and the surface of the material is further enhanced. However, the pretreatment method requires special equipment, is expensive, and causes damage to the surface of the material after the treatment.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a special fluorine-containing pressure-sensitive adhesive and a preparation method thereof, so as to solve the problems that the prior art has poor bonding effect between an adhesive and the surface of a material, needs special equipment for treatment, has high cost and can damage the surface of the material.

In order to solve the technical problems, the invention adopts the following technical scheme:

the special fluorine-containing pressure-sensitive adhesive comprises an adhesive and a base material, wherein the adhesive is coated on one side surface of the base material; the adhesive comprises a component A and a component B;

the component A comprises the following components in percentage by mol: 5 to 50 percent of pentafluorobenzene-containing functional monomer; 0.1 to 0.5 percent of initiator; the soft monomer accounts for 50 to 95 percent; 0 to 50 percent of hard monomer; 0 to 50 percent of cross-linking agent.

The component B is a solvent, and the mole number of the component B is 3-8 times of the total mole number of the component A.

Preferably, the pentafluorobenzene-containing functional monomer is pentafluorobenzyl acrylate, and the soft monomer comprises butyl acrylate, ethyl acrylate and isooctyl acrylate.

Preferably, the hard monomer comprises methyl methacrylate and styrene.

Preferably, the crosslinking agent is a glycidyl methacrylate crosslinking agent.

Preferably, the initiator is azobisisobutyronitrile.

Preferably, the solvent is ethyl acetate.

The invention provides a preparation method of a monomer with a pentafluorobenzene function, which comprises the following steps:

adding a fluorine-containing benzene structure compound and acrylic acid or acryloyl chloride into a reactor, heating for reaction, and extracting, cleaning and separating to obtain the monomer containing the pentafluorobenzene function.

Preferably, the molar mass ratio of the fluorobenzene structure-containing compound to acrylic acid or acryloyl chloride is (1-3): (1-4) the reaction time is 2-3 h.

The invention also provides a preparation method of the special fluorine-containing pressure-sensitive adhesive, which comprises the following steps:

(1) under the protection of argon, adding a solvent and other raw materials into a reactor according to the formula of the invention, finally adding an initiator for heating reaction, and washing and drying to obtain a pure polymer;

(2) and (2) coating the polymer obtained in the step (1) on a fluorine-containing polymer material to obtain the special fluorine-containing pressure-sensitive adhesive.

Preferably, the fluoropolymer material in step (2) is a fluoropolymer membrane.

Compared with the prior art, the invention has the following beneficial effects:

1. the special fluorine-containing pressure-sensitive adhesive is prepared by using a pentafluorobenzene-containing functional monomer as a raw material and matching a soft monomer, a hard monomer, a crosslinking agent and a solvent; aiming at materials with low surface tension, particularly fluorine-containing materials, the special fluorine-containing pressure-sensitive adhesive has excellent adhesive property, introduces fluorine element to acrylic ester, reduces the surface energy of the pressure-sensitive adhesive, and improves the adhesive strength of the pressure-sensitive adhesive to inert materials, particularly fluorine-containing materials; meanwhile, due to the fact that the fluorocarbon bond energy is large and groups contained in a benzene ring are introduced, irregular winding of the fluorocarbon chain is reduced, and the bonding performance of the special fluorine-containing pressure-sensitive adhesive is remarkably improved.

2. The invention mainly aims at materials with lower surface tension, particularly fluorine-containing materials, the preparation method adopted by the invention does not need special equipment to pretreat the surface of a base material, the preparation process is simple, the production cost is lower, the special fluorine-containing pressure-sensitive adhesive can be obtained only by directly coating the prepared adhesive on the surface of the fluorine-containing polymer material, the integrity of the surface of the fluorine-containing polymer material is well ensured, meanwhile, the adhesive and the fluorine-containing polymer material have excellent bonding strength, and the pressure-sensitive adhesive prepared by the invention has excellent initial adhesion, holding adhesion and peeling resistance.

3. The invention provides a new thought and development direction for the development of the pressure-sensitive adhesive, and the pressure-sensitive adhesive has better guarantee on the cohesive force, solvent resistance, adhesive force and the like of the fluorine-containing polymer material during bonding, has high crosslinking speed and does not discharge solvent.

Detailed Description

The present invention will be further described with reference to the following examples.

Special fluorine-containing pressure-sensitive adhesive

the component A comprises the following components in percentage by mol: 5 to 50 percent of pentafluorobenzene-containing functional monomer; 0.1 to 0.5 percent of initiator; 50-95% of soft monomer, 0-50% of hard monomer and 0-50% of cross-linking agent;

In specific implementation, the pentafluorobenzene-containing functional monomer is pentafluorobenzyl acrylate, the pentafluorobenzene-containing functional monomer is prepared from a fluorobenzene-containing structural compound, and the soft monomer comprises butyl acrylate, ethyl acrylate and isooctyl acrylate. The hard monomer comprises methyl methacrylate and styrene. The cross-linking agent is glycidyl methacrylate cross-linking agent. The initiator is azobisisobutyronitrile. The solvent is ethyl acetate.

The special fluorine-containing pressure-sensitive adhesive provided by the invention mainly aims at materials with lower surface tension, particularly comprises fluorine-containing materials, and has excellent adhesive property.

In the component a of the adhesive for the special fluorine-containing pressure-sensitive adhesive described in embodiments 1 to 5, the pentafluorobenzene-containing functional monomer is pentafluorobenzyl acrylate, the soft monomer is butyl acrylate, the hard monomer is methyl methacrylate, and the crosslinking agent is methyl methacrylate, and the specific amounts are shown in table 1.

TABLE 1

Raw materials (mol)	Example 1	Example 2	Example 3	Example 4	Example 5
						Acrylic acid butyl ester	8	7	6	5	4
Acrylic acid pentafluorobenzyl ester	1	1	1	1	1
						Methacrylic acid methyl ester	1	2	3	4	5
Azobisisobutyronitrile	0.05	0.05	0.05	0.05	0.05
						Ethyl acetate	40	40	40	40	40

The initial adhesion of the examples is tested by using a GB-4852-1984 pressure sensitive adhesive tape initial adhesion test method (rolling ball method), the permanent adhesion of the examples is tested by using a GB/T-4851-1998 adhesive tape permanent adhesion test method, the peel strength of the examples is tested by using a GB/T-4851-1998 adhesive tape peel strength test method, and the relevant performances of the examples 1-5 are shown in Table 2.

TABLE 2

	Example 1	Example 2	Example 3	Example 4	Example 5
						Initial viscosity (ball)	17	22	16	14	10
Viscosity (time/min)	45	54	63	46	55
						180 DEG peeling off [ N/25mm ]]	12.3	9.3	14.1	10.7	11.6

In the component a of the adhesive for the special fluorine-containing pressure-sensitive adhesive in embodiments 6 to 10, the pentafluorobenzene-containing functional monomer is pentafluorobenzyl acrylate, the soft monomer is butyl acrylate, the hard monomer is styrene, and the crosslinking agent is glycidyl methacrylate, and the specific amount is shown in table 3.

TABLE 3

Raw materials (mol)	Example 6	Example 7	Example 8	Example 9	Example 10
						Acrylic acid butyl ester	3	2.5	2	1.5	1
Acrylic acid pentafluorobenzyl ester	1	1	1	1	1
						Styrene (meth) acrylic acid ester	0.5	0.5	0.5	0.5	0.5
Glycidyl methacrylate	0.5	1	1.5	2	2.5
						Azobisisobutyronitrile	0.025	0.025	0.025	0.025	0.025
Ethyl acetate	20	20	20	20	20

The same detection method as that used in examples 1 to 5 was used to perform the performance detection of examples 6 to 10, and the detection results are shown in Table 4.

TABLE 4

	Example 6	Example 7	Example 8	Example 9	Example 10
						Initial viscosity (ball)	23	22	17	10	5
Viscosity (time/min)	88	120	340	380	600
						180 DEG peeling off [ N/25mm ]]	9.4	10.2	13.4	13.6	15.7

In the component a of the adhesive for the special fluorine-containing pressure-sensitive adhesive in embodiments 11 to 15, the pentafluorobenzene-containing functional monomer is pentafluorobenzyl acrylate, the soft monomer is butyl acrylate, and no hard monomer and no crosslinking agent are added, and the specific amount is shown in table 5.

TABLE 5

Raw materials (mol)	Example 11	Example 12	Example 13	Example 14	Example 15
						Acrylic acid butyl ester	9	4	2.5	1.5	1
Acrylic acid pentafluorobenzyl ester	1	1	1	1	1
						Azobisisobutyronitrile	0.05	0.025	0.0165	0.0125	0.01
Ethyl acetate	40	20	13.2	10	8

The same test methods as those used in examples 1 to 5 were used to test the performances of examples 11 to 15, and the correlation performances are shown in Table 6.

TABLE 6

	Example 11	Example 12	Example 13	Example 14	Example 15
						Initial viscosity (ball)	21	20	24	22	18
Viscosity (time/min)	45	78	63	72	88
						180 DEG peeling off [ N/25mm ]]	12.3	15.6	11.4	10.7	12

In the component a of the adhesive for the special fluorine-containing pressure-sensitive adhesive described in embodiments 16 to 19, the pentafluorobenzene-containing functional monomer is pentafluorobenzyl acrylate, the soft monomer is butyl acrylate, no hard monomer is added, and the crosslinking agent is methyl methacrylate, and the specific amount is shown in table 7.

TABLE 7

Raw materials (mol)	Example 16	Example 17	Example 18	Example 19
					Acrylic acid butyl ester	3.5	3	2.5	2
Acrylic acid pentafluorobenzyl ester	1	1	1	1
					Glycidyl methacrylate	0.5	1	1.5	2
Azobisisobutyronitrile	0.025	0.025	0.025	0.025
					Ethyl acetate	20	20	20	20

The same detection methods as those used in examples 1 to 5 were used to further detect the properties of examples 16 to 19, and the correlation properties are shown in Table 8.

TABLE 8

	Example 16	Example 17	Example 18	Example 19
					Initial viscosity (ball)	18	15	6	3
Viscosity (time/min)	62	73	88	140
					180 DEG peeling off [ N/25mm ]]	11.9	14.5	13.2	15

In the component a of the adhesive for the special fluorine-containing pressure-sensitive adhesive of embodiments 20 to 24, the pentafluorobenzene-containing functional monomer is pentafluorobenzyl acrylate, the soft monomer is ethyl acrylate, the hard monomer is methyl methacrylate, and no crosslinking agent is added, and the specific amount is shown in table 7.

TABLE 9

Raw materials (mol)	Example 20	Example 21	Example 22	Example 23	Example 24
						Acrylic acid ethyl ester	8.5	7.5	6.5	5.5	4.5
Acrylic acid pentafluorobenzyl ester	1	2	3	4	5
						Methacrylic acid methyl ester	0.5	0.5	0.5	0.5	0.5
Azobisisobutyronitrile	0.025	0.025	0.025	0.025	0.025
						Ethyl acetate	30	30	30	30	30

The same detection method as that used in examples 1 to 5 was used to detect the performance of examples 20 to 24, and the correlation properties are shown in Table 10.

Watch 10

	Example 20	Example 21	Example 22	Example 23	Example 24
						Initial viscosity (ball)	19	17	15	17	15
Viscosity (time/min)	89	102	145	132	121
						180 DEG peeling off [ N/25mm ]]	12.3	12.6	14.4	13.2	13.5

In the component a of the adhesive for the special fluorine-containing pressure-sensitive adhesive in embodiments 25 to 29, the pentafluorobenzene-containing functional monomer is pentafluorobenzyl acrylate, the soft monomer is ethyl acrylate, the hard monomer is styrene, and the crosslinking agent is glycidyl methacrylate, and the specific amount is shown in table 11.

TABLE 11

Raw materials (mol)	Example 25	Example 26	Example 27	Example 28	Example 29
						Acrylic acid ethyl ester	6.5	6	5.5	5	4.5
Acrylic acid pentafluorobenzyl ester	2	2	2	2	2
						Styrene (meth) acrylic acid ester	1	1	1	1	1
Glycidyl methacrylate	0.5	1	1.5	2	2.5
						Azobisisobutyronitrile	0.025	0.025	0.025	0.025	0.025
Ethyl acetate	40	40	40	40	40

The same test methods as those used in examples 1 to 5 were used to test the performances of examples 25 to 29, and the related performances are shown in Table 12.

TABLE 12

	Examples25	Example 26	Example 27	Example 28	Example 29
						Initial viscosity (ball)	14	13	10	7	5
Viscosity (time/min)	128	160	350	389	456
						180 DEG peeling off [ N/25mm ]]	13.3	13.8	14.3	14.3	15.4

In the component a of the adhesive for the special fluorine-containing pressure-sensitive adhesive in embodiments 30 to 34, the pentafluorobenzene-containing functional monomer is pentafluorobenzyl acrylate, the soft monomer is ethyl acrylate, and no hard monomer and crosslinking agent are added, and the specific amount is shown in table 13.

Watch 13

The same test methods as those used in examples 1 to 5 were used to test the performances of examples 30 to 34, and the related performances are shown in Table 14.

TABLE 14

	Example 30	Example 31	Example 32	Example 33	Example 34
						Initial viscosity (ball)	20	22	19	15	13
Viscosity (time/min)	60	123	143	178	188
						180 DEG peeling off [ N/25mm ]]	10.3	13.6	14.4	13.1	113.5

In the component a of the adhesive for the special fluorine-containing pressure-sensitive adhesive of embodiments 35 to 39, the pentafluorobenzene-containing functional monomer is pentafluorobenzyl acrylate, the soft monomer is ethyl acrylate, no hard monomer is added, and the crosslinking agent is glycidyl methacrylate, and the specific amount is shown in table 15.

Watch 15

Raw materials (mol)	Example 35	Example 36	Example 37	Example 38	Example 39
						Acrylic acid ethyl ester	7	6	5	4	3
Glycidyl methacrylate	1	2	3	4	5
						Acrylic acid pentafluorobenzyl ester	2	2	2	2	2
Azobisisobutyronitrile	0.005	0.005	0.005	0.005	0.005
						Ethyl acetate	30	30	30	30	30

The same test methods as those used in examples 1 to 5 were used to test the performances of examples 35 to 39, and the related performances are shown in Table 16.

TABLE 16

	Example 35	Example 36	Example 37	Example 38	Example 39
						Initial viscosity (ball)	15	12	8	6	2
Viscosity (time/min)	189	351	523	698	723
						180 DEG peeling off [ N/25mm ]]	13.3	14.1	15.2	15.5	16.7

In the component a of the adhesive for the special fluorine-containing pressure-sensitive adhesive in embodiments 40 to 44, the pentafluorobenzene-containing functional monomer is pentafluorobenzyl acrylate, the soft monomer is isooctyl acrylate, the hard monomer is methyl methacrylate, and no crosslinking agent is added, and the specific amount is shown in table 17.

TABLE 17

Raw materials (mol)	Example 40	EXAMPLE 41	Example 42	Example 43	Example 44
						Acrylic acid isooctyl ester	3.5	3	2.5	2	1.5
Acrylic acid pentafluorobenzyl ester	1	1	1	1	1
						Methacrylic acid methyl ester	0.5	1	1.5	2	2.5
Azobisisobutyronitrile	0.001	0.001	0.001	0.001	0.001
						Ethyl acetate	15	15	15	15	15

The same test methods as those used in examples 1 to 5 were used to test the performances of examples 40 to 44, and the related performances are shown in Table 18.

Watch 18

	Example 40	EXAMPLE 41	Example 42	Example 43	Example 44
						Initial viscosity (ball)	17	15	14	11	10
Viscosity (time/min)	55	68	90	132	143
						180 DEG peeling off [ N/25mm ]]	10.3	11.6	11.8	12.3	13.1

In the component a of the adhesive for the special fluorine-containing pressure-sensitive adhesive of embodiments 45 to 49, the pentafluorobenzene-containing functional monomer is pentafluorobenzyl acrylate, the soft monomer is isooctyl acrylate, the hard monomer is styrene, and the crosslinking agent is glycidyl methacrylate, and the specific amounts are shown in table 19.

Watch 19

Raw materials (mol)	Example 45	Example 46	Example 47	Example 48	Example 49
						Acrylic acid isooctyl ester	3	2.5	2	1.5	1
Acrylic acid pentafluorobenzyl ester	1	1	1	1	1
						Glycidyl methacrylate	0.5	0.5	0.5	0.5	0.5
Styrene (meth) acrylic acid ester	0.5	1	1.5	2	2.5
						Azobisisobutyronitrile	0.001	0.001	0.001	0.001	0.001
Ethyl acetate	15	15	15	15	15

The same detection methods as those used in examples 1 to 5 were used to detect the properties of examples 45 to 49, and the properties are shown in Table 20.

Watch 20

	Example 45	Example 46	Example 47	Example 48	Example 49
						Initial viscosity (ball)	18	16	15	14	13
Viscosity (time/min)	67	123	163	172	256
						180 DEG peeling off [ N/25mm ]]	10.5	11.6	12.1	13.7	13.9

In the component a of the adhesive for the special fluorine-containing pressure-sensitive adhesive in embodiments 50 to 54, the pentafluorobenzene-containing functional monomer is pentafluorobenzyl acrylate, the soft monomer is isooctyl acrylate, and no hard monomer and crosslinking agent are added, and the specific amount is shown in table 21.

TABLE 21

Raw materials (mol)	Example 50	Example 51	Example 52	Example 53	Example 54
						Acrylic acid isooctyl ester	9	4	2.5	1.5	1
Acrylic acid pentafluorobenzyl ester	1	1	1	1	1
						Azobisisobutyronitrile	0.05	0.025	0.0165	0.0125	0.01
Ethyl acetate	40	20	13.2	10	8

The same test methods as those used in examples 1 to 5 were used to test the performances of examples 50 to 54, and the related performances are shown in Table 22.

TABLE 22

	Example 50	Example 51	Example 52	Example 53	Example 54
						Initial viscosity (ball)	22	20	21	21	17
Viscosity (time/min)	67	115	143	172	188
						180 DEG peeling off [ N/25mm ]]	10.4	12.1	11.4	12.7	13.3

In the component a of the adhesive for the special fluorine-containing pressure-sensitive adhesive of embodiments 55 to 58, the pentafluorobenzene-containing functional monomer is pentafluorobenzyl acrylate, the soft monomer is isooctyl acrylate, no hard monomer is added, and the crosslinking agent is glycidyl methacrylate, and the specific amount is shown in table 23.

TABLE 23

The same test methods as those used in examples 1 to 5 were used to test the performances of examples 55 to 58, and the related performances are shown in Table 24.

Watch 24

	Example 55	Example 56	Example 57	Example 58
					Initial viscosity (ball)	18	15	6	3
Viscosity (time/min)	62	73	88	140
					180 DEG peeling off [ N/25mm ]]	11.9	14.5	13.2	15

Meanwhile, the pressure-sensitive adhesive in the prior art is adopted as comparative examples 1-4, and the specific raw materials are shown in Table 25.

TABLE 25

Raw materials (mol)	Comparative example 1	Comparative example 2	Comparative example 3	Comparative example 4
					Acrylic acid butyl ester	10	5	3.5	2.5
Methacrylic acid methyl ester	5	2	1.5	1
					Acrylic acid	4	2	0.67	0.5
Acrylic acid dodecafluoroheptyl ester	1	1	1	1
					Dibenzoyl peroxide	0.03	0.015	0.009	0.0075
Ethyl acetate	60	30	18.2	15

Performance of comparative examples 1 to 4 was examined by the same examination method as in examples 1 to 5, and the correlation properties are shown in Table 26.

Watch 26

	Comparative example 1	Comparative example 2	Comparative example 3	Comparative example 4
					Initial viscosity (ball)	6	6	7	7
Viscosity (time/min)	55	75	80	95
					180 DEG peeling off [ N/25mm ]]	6	8	8	11.5

Comparing the performance tables of the comparative example and the examples, it can be seen that the initial adhesion, the permanent adhesion and the 180 DEG peel strength of the pressure-sensitive adhesive of the prior art are all weaker than those of the examples of the invention, which also shows that the special fluorine-containing pressure-sensitive adhesive of the invention has good re-stripping performance, higher peel strength, larger permanent adhesion and initial adhesion, and has no solvent discharge during the use and excellent adhesive performance.

Preparation of pentafluorobenzene-containing functional monomer

The invention discloses a pentafluorobenzene-containing functional monomer which is pentafluorobenzyl acrylate, and a preparation method thereof, wherein the preparation method comprises the following steps:

Example 59:

calculating the components according to the molar mass ratio: putting a certain amount of acetone into a single-neck flask, adding 5-8mol of potassium carbonate suspended in the acetone, 1.5-4mol of acrylic acid, 1-2mol of benzyl pentafluorobromide and 0.1-0.3 mmol of 2, 6-di-tert-butyl-p-cresol. Condensing and refluxing for 3 hours at 65 ℃, completing the reaction, filtering the mixture, dissolving residues in diethyl ether, extracting with water, eluting a water phase with sodium bicarbonate and water, removing water from an organic phase with anhydrous sodium sulfate, distilling under reduced pressure to remove the solvent, and finally separating by utilizing column chromatography to obtain the product of pentafluorobenzyl acrylate.

The reaction formula is as follows:

example 60:

calculating the components according to the molar mass ratio: taking a certain amount of dichloromethane into a single-neck flask, adding 2-5mol of triethylamine, 2-4mol of acryloyl chloride and 1-3mol of pentafluorobenzyl alcohol, and reacting at room temperature for 2-3 hours to finish the reaction. Extracting, removing water from the organic phase by using anhydrous sodium sulfate, removing the solvent by reduced pressure distillation, and finally separating by utilizing a column chromatography to obtain the product of the pentafluorobenzyl acrylate.

The reaction formula is as follows:

preparation method of special fluorine-containing pressure-sensitive adhesive

The method for preparing the special fluorine-containing pressure-sensitive adhesive comprises the following steps:

(1) under the protection of argon, sequentially adding raw materials into a reactor for carrying out a sexual heating reaction, and then washing and drying to obtain a pure polymer;

(2) and (2) coating the polymer obtained in the step (1) on a fluorine-containing polymer material to obtain the special fluorine-containing pressure-sensitive adhesive. Wherein the fluoropolymer material in step (2) is a fluoropolymer membrane.

In specific implementation, argon is introduced into the reactor for 30min, raw materials are prepared according to the component proportion table of the embodiment 1-58, the solvent is divided into two parts with the same amount, wherein one part of the solvent, the soft monomer, the pentafluorobenzene ring functional monomer and the hard monomer are added into the reactor, and the mixture is heated to 75 ℃ for condensation reflux; and mixing the other part of solvent and an initiator to form a mixed solution, dividing the mixed solution into two parts with the same quantity, slowly dropwise adding one part of the mixed solution into the reactor, reacting for 4 hours after dropwise adding, continuously and slowly dropwise adding the rest of the mixed solution, reacting for 4 hours after dropwise adding, heating to 80 ℃, reacting for 3 hours, and ultrasonically washing for 3 times by using methanol after the reaction is finished. Drying for 10 hours at 65 ℃ in a vacuum drying environment to obtain pure fluorine-containing polymer. Coating the obtained polymer on a film of the fluorine-containing polymer material to obtain the special fluorine-containing pressure-sensitive adhesive. The coating may be a flat coating method, a knife coating method, a spin coating method, or the like, and the thickness of the fluoropolymer material film is 20 μm.

The performances of the special fluorine-containing pressure-sensitive adhesives of the embodiments 1-58 are tested, the initial adhesion of the embodiments is tested by using a GB-4852-1984 pressure-sensitive adhesive tape initial adhesion test method (rolling ball method), the permanent adhesion of the embodiments is tested by using a GB/T-4851-1998 adhesive tape permanent adhesion test method, and the peel strength of the embodiments is tested by using a GB/T-4851-1998 adhesive tape peel strength test method.

Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that those further modifications or equivalent substitutions to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions should be covered in the claims of the present invention.

Claims

1. The special fluorine-containing pressure-sensitive adhesive is characterized by comprising an adhesive and a base material, wherein the adhesive is coated on one side surface of the base material; the adhesive comprises a component A and a component B;

the component A comprises the following components in percentage by mol: 5-50% of a pentafluorobenzene-containing functional monomer; the initiator is 0.1% -0.5%; the soft monomer accounts for 50% -95%; the hard monomer is 0% -50%; 0% -50% of a cross-linking agent;

2. The special fluorine-containing pressure-sensitive adhesive as claimed in claim 1, wherein the pentafluorobenzene-containing functional monomer is pentafluorobenzyl acrylate, and the soft monomer comprises butyl acrylate, ethyl acrylate and isooctyl acrylate.

3. The special fluorine-containing pressure-sensitive adhesive as claimed in claim 1, wherein the hard monomer comprises methyl methacrylate and styrene.

4. The special fluorine-containing pressure-sensitive adhesive as claimed in claim 1, wherein the crosslinking agent is glycidyl methacrylate crosslinking agent.

5. The specialty fluorine-containing pressure sensitive adhesive of claim 1, wherein said initiator is azobisisobutyronitrile.

6. The specialty fluorine-containing pressure sensitive adhesive of claim 1, wherein said solvent is ethyl acetate.

7. A method for preparing a pentafluorobenzene-containing functional monomer according to claim 1, wherein the method comprises the steps of:

8. The preparation method of the pentafluorobenzene-containing functional monomer according to claim 7, wherein the molar mass ratio of the fluorobenzene structure-containing compound to acrylic acid or acryloyl chloride is (1-3): (1-4) the reaction time is 2-3 h.

9. The preparation method of the special fluorine-containing pressure-sensitive adhesive is characterized by comprising the following steps:

(1) under the protection of argon, adding a solvent and other raw materials into a reactor according to the formula of the right 1-6, finally adding an initiator for heating reaction, and washing and drying to obtain a pure polymer;

10. The method for preparing special fluorine-containing pressure-sensitive adhesive according to claim 9, wherein the fluorine-containing polymer material in the step (2) is a fluorine-containing polymer film.